Baffle for steam-boilers.



No. 794,711. PATBNTED JULY 18, 1905.

J. S. HAMMERSLOUGH.

BAFFLB FOR STEAM BOILERS.

APPLICATION FILED SEPT. 19, 1904.

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proved baffle or bridge 1n section in position UNITED ST TES PatentedJuly 18, 1905.

PATENT OFFICE.

" BAFFLE FOR STEAM-BOILERS.

SPECIFICATION forming part of Letters Patent No. 794,711, dated July 18,1905. Application filed fieptemher 19, 1904. Serial No. 22 1,981-

To all whom it rncty concern:

Be it known that I, JosEPH S. HAMMER- 'SLOUGH, residing in Milwaukee, inthe county of Milwaukee and State of Wisconsin, have invented new anduseful Improvements in Baiiies, Bridges, or Abutments for Steam-Boilers, of which the following is a descrip tion, reference being hadto the accompanying drawings, which are a part of this specification.

My invention relates to an improved baflie, bridge, or abutment archemployed or to be employed in a boiler-furnace or steam-boiler,

especially a boiler having return combustion or smoke flues.

The object of the invention is to provide a bafile or bridge to be usedin connection with the combustion-chamber of the furnace that is adaptedto be filled with water from the boiler, whereby the baffle or bridge isprotected against being burned out, the combustion in thecombustion-chamber is made more complete and is better controlled, andwhere by a greater heating-surface and capacity to the boiler isobtained and a better circulation of the water in the boiler is secured.

The invention consists of the baffle or bridge and its combinations, asherein described and claimed, or the equivalents thereof.

In the drawings, Figure 1 shows my imat the rear end of acombustion-chamber in a return -flue boiler and secured detachablythereto, which boiler is shown fragmentarily in section. Fig. 2 shows myimproved baffle or bridge in section located permanently in the rear endof the combustion-chamber of a return-flue boiler, which is shownfragmentarily in section. Fig.3 is an end view of the flue-plate andshell of the boiler and my improved bridge of the form shown in sectionin Fig. 1, and Fig. 4c is an end view of the return-flue sheet-plate andshell of the boiler with my improved bridge or battle in the form shownin Fig. 2.

In the drawings, 5 indicates the exterior cylindrical shell of theboiler. Within the boiler is the smaller cylindrical combustion-chambershell 6, which at its front end and at the rear end is secured in placewithin and at a distance from the boiler-shell by a boiler or flue plate7. The combustion-chamber 8 is encircled by and formed within the shell6, and there is a water and steam chamber 9, which surrounds thecombustion-chamber 8. Tubes 10 10, fixed at their ends in the flue orboiler plates 7 at the respective ends of the boiler, only one of whichis shown, form flues for the return of the products of combustion fromthe rear combustion or smoke chamber 11 to the front end of the boiler.

The construction so far described is in common use, and therefore onlyso much of the boiler, combustion-chamber, and return-fiues are shownand described as is necessary to illustrate the use of my improvedbaffle or bridge. In boilers of this class the combustion-chamber is inelongated cylindrical form and is disposed in horizontal position, sothat the products of the fire in the fire-box at the front end ofthecombustion-chamber flow freely into and through thecombustion-chamber into a smoke-chamber 11 and thence on through thefines 10 to a stack, chimney, or suitable outlet. Such free flow of theproducts of combustion from the fire-box through the combustion-chamberhas heretofore been in a measure arrested or baffled by some sort of abridge, arch, or similar device, usually made of brick and in a solidform, arrange at the rear end of the combustion-chamber to prevent theunlimited and undesirable free flow of the products of combustionthrough the combustion-chamber. My improved device consists of a hollowbridge, baffle, or abutment device located or adapted to be located inor near the rear end of the combustion-chamber, and, as shown in Fig. 1,may consist of a hollow annular ring or waterchamber 12, formed ofboiler-plate or analogous material, so bent as to form an exteriorcircular and peripheral wall 13, opposing outer and inner walls 1 1, andan inner wall 15, thus providing a hollow device of such diameter orperipheral size as just to fit easily within the rear end of the shell6, thus closing that end of the combustion-chamber, except to the extentof an inner opening or passage 16, around which on all sides there isthe waterchamber 17 The opening or passage 16 peropening that issomewhat elongated laterally mits the outflow through this baflie,bridge, or abutment of only a limited amount of the products ofcombustion within the combustion-chamber 8, thus serving to retain theheat and products of combustion within the combustion-chamber until atleast the process of combustion therein is completed. The waterchamber17 is provided with apertures 18, and in the case of the form of deviceshown in Figs. 1 and 3 with water-ducts 19, leading from the chamber 17to the water-chamber 9 of the boiler, so that there is a free flow ofthe water from the boiler into and through the chamber 17. By this meansthe walls of the bafiie are protected against being burned out by theheat of combustion, while at the same time the water in the boiler beingpermitted to flow freely into and through the baflie-chamber is therebybrought into additional and closer relations to the heat in thecombustionchamber, whereby the water in the baflie-chamher beingadditionally heated is returned to the boiler, giving additional heatthereto. In other words, the baflie provides additional surface-exposedto the heat of the combustionchamber for heating the water of theboiler.

As shown in Figs. 1 and 3, the baffle may be conveniently formed of twosheets of boilerplate so cut and turned as to form the exteriorperipheral wall 13 of the baflie, and the interior peripheral wall 15about the opening 16 and the plates at their junction being securedtogether by rivets form the water-tight chamber 17. The form of theopening 16 in cross-section is not important, although an is asatisfactory one. The walls of the bafiie may also be held together andstrengthened by transverse screw-bolts 20 in such numbers as may bedeemed necessary. Also, advisably,

openings closed by any suitable and releasable means 21 are providedthrough the exterior wall of the baflie for permitting of its beingcleaned out when the conditions demand it.

In the form of construction shown in Figs. 2 and 4 the baffle instead ofbeing made de tachable from the boiler is constructed permanentlytherein by means of two plates 14 14 of proper size and form havingtheir edges turned over and formed, respectively, into a flange, theplates being fitted into the shell 6 at a little distance apart and bymeans of their fianges 22 riveted to the shell 6, forming between themand within the shell 6 the water- -chamber 17. The inner passage 16through the baffle is formed by turning adjacent portions of the platesinwardly toward each other and causing them to lap together, and beingriveted to each other form the inner peripheral wall of the chamber 17about the opening or passage 16. Stay-bolts 20 may also be employed inthis form of bafiie to secure the walls in position relative to eachother. In this form of device the apertures 18 are made through the wall6 directly into the waterchamber 9 from the chamber 17.

What I claim as my invention is- 1. In combination, a horizontalsteam-boiler having a combustion-chamber and a water and steam chamberabout and inclosing the combustion-chamber and of substantially equallength, and an abutment in the combustionchamber at the rear end thereofconsisting of v an independent hollow water-chamber entirely across andclosing the combustion-chamber from front to rear except as to a singlemedially-disposed and relatively small passage for the products ofcombustion, relatively small water-passages being provided from thewater chamber of the boiler into the chamber of the abutment.

2. In a horizontally-disposed steam-boiler having acombustion-chamber ofsubstantially equal length within and longitudinally of the boiler, ahollow abutment forming a water chamber in and across thecombustion-chamber near the rear end thereof, the abutment beingprovided with a single passage for the products of combustiontherethrough below a larger portion of the water-chamber in theabutment.

3. In'combination, asteam-boiler with horizontally-disposedcombustion-chamber of substantially equal length through it, and anabutment at the rear end of the boiler in and across the rear end of thecombustion-chamber consisting of an independent hollow annularwater-chamber formed of metal plates within and fitted to the encirclingwall of the combustion-chamber and closing it to the passage of theproducts of combustion, except by a medial and relatively small openingor passage through the abutment from front to rear at a distance fromthe wall of the combustionchamber, the chamber in the abutment beingconnected by relatively small water-passages to the water-chamber in theboiler.

In testimony whereof I afiix my signature in presence of two witnesses.

JOSEPH S. HAMMERSLOUGH.

